I 
9. 
10. 
13. 
14. 
16 
DALMEYER BERGHEIM PORTRAIT LENSE. 
DALMEYER STIGMATIC LENSE. 
Nos. 1-7 exhibited by E. and H. T. Anthony. 
New Puotrocrapuic APPARATUS. Exhibited by Scoville 
& Adams Co. 
Hicu-ciass and. NovEL ‘‘ PRojECTION APPARATUS.” Ex- 
hibited by J. B. Colt & Co. 
New LANTERNS and apparATus. Exhibited by Charles 
Beseler. 
. SAMPLES OF ARTOTYPE, in color. 
. SAMPLES OF FACSIMILE. 
Nos. 11 and 12 exhibited by Edward Bierstadt. 
PHOTO-MICROGRAPHS, in three colors. Exhibited by Edw. 
Leaming, M. D. 
24 PHOTOGRAPHS OF ‘‘ LIGHTNING.” Exhibited by W. N. 
Jennings. 
I. 
be 
“I 
First photograph of lightning ever taken, to prove that 
the discharge is wavy, not zzgzag, as usually repre- 
sented by artists. Taken September 2, 1882, at 
Philadelphia. 
Photograph clearly demonstrating the truth of the 
‘¢wavy line” theory of lightning. 
Artificial lightning (Holtz machine discharged) for 
comparison with real ‘* Jersey Lightning.” 
Divided discharge (forked lightning). 
‘¢‘ Branched” lightning, explaining ‘‘tree marks” often 
found upon the bodies of persons struck by light- 
ning. 
Artificial ‘* branched” discharge (the spark from a 
Holtz machine flashed directly across the face of 
the photographic plate, no lens being employed). 
. Parallel discharges. Stratification due to movement 
of conducting path by the wind. 
